Sounds more expensive? And doesn't tell you where the issue is, unlike a single burned out fuse?
More modules that can be replaced individually or used to diagnose a problem is a good thing.
If an ICE car had all the fuses in a locked box (which required replacing the whole thing when one burned out) you would correctly identify that as a negative for the end user.
I'm sure there were reasons why they went for the alternative at Tesla but "easy to work on" wasn't one of them.